package homework3;

//计算1/1-1/2+1/3-1/4+1/5 …… + 1/99 - 1/100 的值
public class P3 {
    public static void main(String[] args) {
        double sum = 0;
        for (int i = 1; i <= 100; i++) {
            sum += (1.0 / i) * Math.pow(-1, i - 1);
        }
        System.out.println(sum);
    }
}
